Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.5 on date 23-08-2021 and time 19:49:08 (Italy) in region 2 km SW Zafferana Etnea (CT)

A magnitude ML 1.5 earthquake occured in region: 2 km SW Zafferana Etnea (CT), on

  • 23-08-2021 17:49:08 (UTC)
  • 23-08-2021 19:49:08 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 37.6870, 15.0910 at 7 km depth.

The earthquake was located by: Bollettino Sismico Italiano INGV.

Search earthquakes: Any within 30 km radius

The values of hypocentral coordinates and magnitude may be revised at a later time as more information becomes available.

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Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Zafferana Etnea CT 2 9517 9517
Santa Venerina CT 4 8592 18109
Milo CT 5 1087 19196
Trecastagni CT 8 10910 30106
Sant'Alfio CT 8 1582 31688
Pedara CT 8 14102 45790
Viagrande CT 8 8563 54353
Aci Sant'Antonio CT 9 17984 72337
Giarre CT 10 27659 99996
Nicolosi CT 10 7463 107459
Aci Bonaccorsi CT 10 3524 110983
Aci Catena CT 10 29851 140834
Acireale CT 11 52622 193456
Riposto CT 11 14838 208294
San Giovanni la Punta CT 12 23060 231354
Valverde CT 12 7840 239194
Mascali CT 12 14282 253476
Tremestieri Etneo CT 12 20589 274065
Mascalucia CT 13 31958 306023
San Gregorio di Catania CT 14 11966 317989
San Pietro Clarenza CT 14 7743 325732
Gravina di Catania CT 14 25838 351570
Sant'Agata li Battiati CT 14 9479 361049
Belpasso CT 15 28108 389157
Ragalna CT 15 3924 393081
Camporotondo Etneo CT 15 5023 398104
Aci Castello CT 15 18723 416827
Piedimonte Etneo CT 16 3963 420790
Fiumefreddo di Sicilia CT 16 9623 430413
Linguaglossa CT 18 5403 435816
Calatabiano CT 20 5308 441124
Santa Maria di Licodia CT 20 7641 448765
Misterbianco CT 20 49410 498175

Municipalities with at least 50000 inhabitants

An earthquake occurred to
11 Km NW of Acireale (52622 inhabitants)
20 Km N of Catania (314555 inhabitants)
68 Km SW of Reggio di Calabria (183035 inhabitants)
70 Km SW of Messina (238439 inhabitants)
72 Km N of Siracusa (122291 inhabitants)
90 Km NE of Ragusa (73313 inhabitants)
93 Km E of Caltanissetta (63360 inhabitants)
95 Km NE of Vittoria (63339 inhabitants)
96 Km N of Modica (54633 inhabitants)
Recent and historical seismicity
Seismic hazard
Shakemap
Felt maps
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Bulletin
Rev1000 		ML 1.5 2021-08-23
17:49:08		 37.6868 15.091 7 2021-12-29
11:12:52		 Bollettino Sismico Italiano INGV 97945351
Reviewed
Rev200 		ML 1.1 2021-08-23
17:49:08		 37.698 15.085 5 2021-11-29
16:24:03		 Sala Operativa INGV_OE (Catania) 94546731
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-08-23 17:49:08 ± 0.24
Latitude 37.6868 ± 0.0090
Longitude 15.0910 ± 0.0068
Depth (km) 7 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 97945351

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 893
Semi-minor axis of confidence ellipse (meter) 375
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 357
Circular confidence region, given by single value of horizontal uncertainty (meter) 890.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 147
Number of associated phases, regardless of their use for origin computation 20
Number of defining phases 20
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.3
Epicentral distance of station closest to the epicenter (degree) 0.03507
Epicentral distance of station farthest from the epicenter (degree) 0.18076
Number of stations at which the event was observed 14
Number of stations from which data was used for origin computation 14
Magnitudes information

ML:1.5

Field Value
Value 1.5
Uncertainty 0.3
Num. used stations 6
Type of magnitude ML
Reference to an origin 97945351
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-11-29 16:23:48

ML:1.1

Field Value
Value 1.1
Uncertainty 0.1
Num. used stations
Type of magnitude ML
Reference to an origin 94546731
Agency INGV
Autore Sala Operativa INGV_OE (Catania)
Time of creation (UTC) 2021-08-23 17:55:46
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.EPOZ.HHZ. 2021-08-23T17:49:14.29 0.6 undecidable manual S 101 8.6802 127 1.53 28
IV.ESLN.HHZ. 2021-08-23T17:49:13.45 0.6 undecidable manual S 274 10.2786 123 0.25 47
IV.EMPL.HHZ. 2021-08-23T17:49:13.15 0.6 undecidable manual S 265 10.6782 122 -0.16 48
IV.ESML.HHZ. 2021-08-23T17:49:13.40 0.6 undecidable manual P 248 20.0688 108 0.21 47
IV.ESPC.HHN. 2021-08-23T17:49:12.35 0.6 undecidable manual S 276 5.5944 140 0.38 47
IV.EMNR.HHZ. 2021-08-23T17:49:12.85 0.3 undecidable manual P 338 15.4734 113 0.52 66
IV.EPIT.HHZ. 2021-08-23T17:49:12.40 0.1 undecidable manual P 348 14.0748 115 0.32 93
IV.EVRN.HHZ. 2021-08-23T17:49:11.49 0.6 undecidable manual S 86 3.8961 150 -0.15 49
IV.EPDN.HHZ. 2021-08-23T17:49:11.37 0.3 undecidable manual P 323 10.878 121 -0.14 73
IV.EMFO.HHE. 2021-08-23T17:49:11.98 0.6 undecidable manual S 359 5.3946 141 0.05 50
IV.EPOZ.HHZ. 2021-08-23T17:49:11.16 0.1 undecidable manual P 101 8.6802 127 0.01 100
IV.EMCN.HHN. 2021-08-23T17:49:11.78 0.1 undecidable manual P 336 12.5763 118 -0.03 99
IV.ESLN.HHZ. 2021-08-23T17:49:11.20 0.3 undecidable manual P 274 10.2786 123 -0.2 72
IV.EMPL.HHZ. 2021-08-23T17:49:11.37 0.3 undecidable manual P 265 10.6782 122 -0.09 74
IV.ECBD.HHN. 2021-08-23T17:49:11.36 0.1 undecidable manual P 358 10.3785 123 -0.06 99
IV.EMFS.HHE. 2021-08-23T17:49:11.21 0.1 undecidable manual P 294 8.9799 127 0.03 100
IV.ESPC.HHN. 2021-08-23T17:49:10.59 0.1 undecidable manual P 276 5.5944 140 -0.11 99
IV.EVRN.HHZ. 2021-08-23T17:49:10.08 0.1 undecidable manual P 86 3.8961 150 -0.42 92
IV.EMFO.HHE. 2021-08-23T17:49:10.41 0.1 undecidable manual P 359 5.3946 141 -0.26 96
IV.ESAL.HHZ. 2021-08-23T17:49:10.85 0.1 positive manual P 27 8.4804 128 -0.26 95
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.EPIT.HHE. ML:1.8 0.000656 0.94 AML other m 2021-08-23T17:49:16.02
IV.EPIT.HHN. ML:1.6 0.000475 0.32 AML other m 2021-08-23T17:49:17.01
IV.EMPL.HHN. ML:1.7 0.0007199999999999999 0.2 AML other m 2021-08-23T17:49:18.16
IV.EMPL.HHE. ML:1.5 0.0004625 0.48 AML other m 2021-08-23T17:49:18.71
IV.ESML.HHN. ML:1.0 0.0000839 0.24 AML other m 2021-08-23T17:49:19.00
IV.ESML.HHE. ML:1.2 0.000142 0.48 AML other m 2021-08-23T17:49:19.67
TDMT - Time Domain Moment Tensor
Fault Plane solutions in the area
Download
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download